Tripping mechanism for excavating machines



Oct. 16, 1934. e. H. oLsoN ET'AL 8 TRIPI'ING MECHANISM FOR EXCAVATING MACHINES Filed July 29, 1932 5 Sheets-Sheet J,

IQ QI illllllllllllll IllllllllllllllllllllllilllHIE! 0a. 16, 1934. a H O SON HAL 1,977,287

TRIPPING MECHANISM FOR EXCAVATING MACHINES Filed July 29, 1932 5 Sheets-Sheet 2 Jzz'Zmer J. E W Mag/ Q Oct. 16, 1934. G. HJOLSON ET AL 1,977,287

TRIPPING MECHANISM FOR EXCAVATING MACHINES Filed July 29, 1932 5 Sheets-Sheet 3 I fnvenfa'nfi 2 a tam .02 72 TJWl 0 O 93 G. H. OLSOIN ET AL 1,977,287

TRIPPING MECHANISM FOR EXCAVATING MACHINES Filed July 29, 1932 V 5 Sheets-Sheet 4 Oct. 16, 1934. G. H. OLSON AL 1,977,287

TRIPPING MECHANISM FOR EXCAVATING MACHINES Filed July 29, 1932 5 Sheets-Sheet 5 Patented Oct. 16, 1934 1 3 U UNITED STATES PATENT; OFFICE 1,917,231 a rmrrmasmcnsmsm roa axoavarmo. r

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Gustaf H. Olson and Hilmer N. Ekbona lll., asslgnors to Link-Belt Company, Chicago, 111., a corporation of Illinois Application my 29, its, was. 1625.805

10 Claims. (cans-14s) Our invention relates to improvements in trip- Figure 3 is a, side view of tlieinechanism shown ping mechanisms for excavatingmachines and.-inaFigure 2; has for one object to provide a new-and 'P'FigureAlisa-longitudinal section through proved form or tripping mechanism usedincon th centeros-ithe' power shaft showing the mech- 5 nection with a latch or door lever used in con isms-associated with it:

nection with the bottom dump or door-oia i v5' is a side view-of the slack cable-take shovel, dipper scoop or bucket. V v v uni-using a sear train;

One object of this invention is to provide a Figure 6 is a bottom plan view of Figure 5; power means for tripping the door latch tofldump Figure? is a side view of a slack take up with 30 the load of the bucket, scoop or dipper. vAnchain drive; p

other object is to provide power means for this Figure 8v is a bottom plan view of Figure 7; purpose wherein the application of power is con- I Figure 9 is .a side view of a slack take up detrolled by the operator and released automati vice using the cable as a connecting means; caliy after the latch has been tripped. Another Figure 10 is a bottom plan view 01' Figure 9; 4o object of this invention is to provide an auto-- Figure 11 is a section along the line 11-11 of matic trip cable rope or slack take up independv Figure 2. I ent of the rotation of the shipper shaft. V Likeparts 'are indicated by like characters In general we use a driving rotatable member throughout the specification and drawings. secured to a power shaft driven by the ex- Referring first to Figure 1, Aindicates a'suitcavators power plant; adriven member rotatable able crawler tread running gear supporting a in relation to the power shaft and having an frame A on which is mounted a combination eccentric portion directly connected tothe latch; gear ring and roller path A which carries a an engaging member which connects and disrotating platform A counterbalanced at A havconnects the driving and driven members; a ingamast A projecting upwardly therefrom,'the so trigger member which operates the engaging mast being held in position by means of stays' member in one direction at the will of the opera- A", the boom A being held in angular position tor to connect the driving and driven members with respect to the mast and the platform by and which automatically operates the engaging cables A. LA is a dipper handle slidable in the member in the opposite direction independent yoke A Pjjwhichyoke is pivoted on the boom. 80 of control of the operator to disconnect the driv- At theqend or the dipper handle is the dipper ing and driven members and a braking member bucketv' having the pivoted door or bottom acting on the driven member whose purpose is dump it", "A" is a cable extending over sheaves to prevent over-running of the driven membe A" associated with the dipper bucket A sheave in its cycle. A" on the. end of the boom A, to the hoisting In order to. provide take up for the trip cable drum-$1 3.; o'r rope we use a take up drum rotatably mount- On-Z the underside of the dipper handle M is ed on or at the axis of the shipper shaft, a toothed araelt -B, engaged by a driving pinion B on the pinion mounted independent of theshipper shaft ahippe'rshaft, B'jwhich shipper shaft is "adapted and meshing with the toothed rack on thedipper to .be-irotatedjby an engine B or by any other handle, a connecting means between 'suchpinion' ui a le, power source, to iv ck and 1711'11" and the take up drum comprising a g ruam, imo'ti'onitothe dipper handle. 3* is a latch adapta chain drive or a belt drive or any combination j 1114 the o m in h k d thereoi' arranged to give such direction of ro -j P n- 5 8 8 extending from the latch tation to the take up drum that-relative mo- 9 the sheave Ba-tp the latchvlever on between rack and pinion Wm is a trip cable extending from the latch lever B" 1 thesheave B concentric with the shi per take up drum and thereby take up the trip cable m th m P u or rope so as to keep it constantly taut independence over sheave B on the lever B v pivoted on the boom A thence to an, anchorage ent of the position of the dlpper handle" on the take up'drum B on the shipper shaft 3" Our invention is illustrated more or less dia- The take updm-m 1: is associated with a g ggg fi 111 the accompanying m- B in men with-an idler pinion B", which in I t turn is in mesh with f'a'pinion B which pinion Figure 1 is a side elevation of a power shovel: is ours sh'aft B in'the bracket B". This shaft Figure 2 is a plan view of the power operated carries a gear B -in, mesh with the rack B on r a the dipper handle so that longitudinal movetrip mechanism,

ment of the rack will cause rotation of the take up drum B in such direction and at such rate as to keep the trip cable 13 taut for all positions of the dipper handle. As the trip cable is drawn in or paid out by the rotation of the take up drum, it always passes out over the sheave B on the lever B thence over the sheave B and thence out along the dipper handle. C is a tripper power cable leading from one end of the lever B under the sheave C concentric with the pivot axis of theboom, thence up over a sheave C thence over a sheave C thence up to an anchor C on the mast A A pull on this cable C will rock the lever B and exert a pull on the trip cable B to rock the latch lever B and exert a tension on the chain B and release the door latch B Referring now to Figures 2 and 3, D is a power shaft. D is a driving member mounted on the stub shaft D which is threaded in and held .against rotation with respect to the driving shaft D. D is a driven member rotatably mounted on the stub shaft D having an eccentric pin D on which the sheave C is rotatably mounted. D is an engaging member slidably mounted in the driven member D This engaging member is yieldingly pressed to the left in Figure 4 by the spring D which abuts at its other end on the cover plate D held in position on the driven member D by means of the screws D. D is a trigger pivoted at D having a working lever D to the free end of which is connected the hand rope D the other end of the hand rope being anchored at D The trigger has a cam portion E which rides in the groove E in the driven member D and locks with a notch E in the engaging member D to hold it in position against the urge of the spring D with its driving jaw E out of engagement with the driving member D When the operator pulls on the hand rope D to rock the latch and lever about the pivot pin'D this cam member E is withdrawn from the engaging member D the spring D pusheslit to the left and causes the jaw E to engage the aperture E in the driving member D thereby locking the driving member D and the driven member D and causing rotation of the eccentric pin D about the center of rotation of the shaft D, thereby exerting a tension on the cable C and so rocking 'the lever B and causing the latch to be disengaged. The cam member E has an inclined cam surface E The relation of the parts is such that the member D never moves far enough to the left to cause the notch E to be masked by the driven member D so that when the operator has pulled the rope D to release the cam, the spring E holds the cam against the driven member D so that near the end of the cycle the cam surface E will engage the notch E in the member D and draw the member D back out of engagement with the driving member D thereby effecting an automatic release of the tension on the rope C, so that all that the operator has to do is to pull once on the rope D", the power mechanism releases the latch and the parts automatically go back into the starting position ready for the next manipulation by the operator. In order to keep the driven member D? from overrunning, it is associated with an adjustable band brake E", the pressure applied by the brake being controlled by the spring E whose tension is adjustable by means of the nuts E to whatever tension is necessary to insure a stoppage of the driven member as soon as the cycle has been completed.

If desired, instead of using the gear train B 18 B it may be desirable to transmit the power as shown in Figures 7 and 8 by means of a sprocket chain F associated with a sprocket F on the shaft B and with a sprocket F" associated withthe take up drum.

If we are dealing with a machine wherein a rack is not used or wherein it is not convenient to take the power for the take up drum from the.

-rack, the take up drum is operated by means of a cable F anchored at each end on the dipper handle, winding about a drum F associated with the take up drum B Under such circumstances longitudinal movement of the dipper handle will cause the desired rotation of the take up drum.

In connection with shovels of the type known as independent crowd shovels where the teeth from that portion of the rack immediately adjacent the stop F are omitted to permit'rotation of the shipper shaft without movementof the dipperhandle, clearly it is necessary that the take up drum be operated not by the shipper shaft but by some connection-with the dipper handle either in connection where power is applied to the rack or the rope as indicated. If, however, the dipper handle is so arranged that movement of the shipper shaft always results in, movement of the dipper handle, it might under some circumstances be desirableto omit the chain or gear train drive or the take up drum and key the take up drum direct to the shipper shaft, under which circumstances, movement of the shippershaft would directly rotate the take' up drum.

While we have shown a power pulley, obviously a sheave or drum around which the cable could be wrapped would work equally well and the same is true of a chain and sprocket combination. The same is true of a latch operating mechanism. A chain which could pass around the pulleys or a chain and sprockets or if desired, merely connecting links, could be used, and

where in the specification and claims we have called for a cable and pulley, it will be understood that we are using this language in its broadest sense as applied to any flexible supporting mechanism and any rotary applying drum and the latch along the boom over a sheave,

bell crank, etc., to provide automatic operation of the latch.

A indicates diagrammatically the excavating machine power plant.

We claim:

1. In combination, a boom, a dipper handle on the boom mounted for longitudinal reciprocation through an'axis of angular displacement, a movable member on the dipperhandle, a cable extending from the movable member to the center I.

which the cable is wound and means operated by the dipperhandle in response to the longitudinal displacement for rotating the drum, and tension exerting means comprising a pulley engaging the cable and means for displacing the pulley.

2. In an excavating machine, a power shaft, a boom, a dipper handle mounted for reciproca- .tion and rotation with respect to the boom, a

dipper and a dipper door, a latch adapted to control the dipper door, a cable extending along the dipper handle from the latch, a drum about which the cable is wound, and means for rotating the drum operated by and in consonance with the longitudinal movement of the dipper handle.

3. In an excavating machine, a dipper, a latch operated door, a door trip mechanism, a rotating driving member, a driven member having an eccentric portion associated with said latch to trip the same as said eccentric is thrown in one direction, an engaging member to connect with and disconnect from the driven member and the driving member and a trigger member for operation of the engaging member, the trigger being adapted to automatically disconnect the engaging member between driving and driven member upon the completion of the cycle.

4. In an excavating machine, a dipper, a latch operated door, a door trip mechanism, a rotating driving member, a driven member having an eccentric portion associated with said latch to trip the same as said eccentric is thrown in one direction, an engaging member to connect and disconnect the driven member with the driving member and a trigger member for operation of the engaging member, the trigger being adapted to automatically disconnect the engaging member between the driving and the driven member upon the completion of the cycle, and a brake associated with the driven member adapted to prevent the driven member from over-running its cycle.

5. An excavating machine, a frame, a boom, a dipper handle, a rack on the handle, means for reciprocating the handle, a bucket on the handle, a latch operated door on the bucket, a dipper trip mechanism adapted to operate the door latch including a cable, a take up drum and means operated by the rack and responsive to the longitudinal movement of the dipper handle for rotating the drum.

6. An excavating machine, a frame, a boom, a dipper handle, means for reciprocating the handle including a shipper shaft, a bucket on the handle, a latch operated door on the bucket, a dipper trip mechanism adapted to operate the door latch including a cable, a take up drum rotatably mounted on the shipper shaft axis and means operated by and responsive to the longitudinal movement of the dipper handle and independent of the shipper shaft for rotating the drum.

7. In combination, a boom, a dipper handle on the boom mounted for longitudinal reciprocation through an axis of angular displacement, a rack on the dipper handle, a movable member on the dipper handle, a take up drum rotatably mounted on the center of rotation of the dipper handle, a cable extending from the movable member to and wound about the drum, and means for rotating the drum to draw in and pay out the cable in consonance with the longitudinal displacement of the dipper handle, said means comprising a gear in mesh with the rack at a pointremoved from the axis of angular displacement and a driving connection between it and the drum, and means associated with the cable under the control of the operator for exerting a tension thereon independent of the position of the boom and the rotation of the drum for displacing the movable member.

8. In combination, a boom, a dipper handle on the boom mounted for longitudinal reciprocation through an axis of angular displacement, a rack on the dipper handle, a movable member on the dipper handle, a take up drum rotatably mounted on the center of rotation of the dipper handle, a cable extending from the movable member to and wound about the drum, and means for rotating the drum to draw in and pay out the cable in consonance with the longitudinal displacement of the dipper handle, said means comprising a gear in mesh with the rack at a point removed from the axis of angular displacement and a driving connection between it and the drum, and means associated with the cable under the control of the operator for exerting a tension thereon independent of the position of the boom and the rotation of the drum for displacing the movable member, said connection including a plurality of meshing gears and adapted to give a positive drive.

9. In combination, a boom, a dipper handle on the boom mounted for longitudinal reciprocation through an axis of angular displacement, a rack on the dipper handle, a movable member on the dipper handle, a take up drum 'rotatably mount ed on the center of rotation of the dipper handle,

a cable extending-from the movable member to .icr exerting a tension thereon independent of the position of the boom and the rotation of the drum ior displacing the movable member.

10. In combination, a boom, a dipper handle on the boom mounted for longitudinal reciprocation through an axis of angular displacement, a movable member on the dipper handle, a take up drum mounted for rotation concentric with the axis of angular displacement, a cable attached "at one end to the movable member and wound to the other end about the drum, and means i'or rotating said drum comprising a flexible cable anchored at each end upon the dipper handle and wound about a part oi the drum whereby longitudinal reciprocation oi. the handle imparts rotation to the drum, and means under the control of the operator associated with that cable which is attached to the movable member for exerting tension on the cable independent oi the longitudinal movement of the handle and independent of the rotation of the drum for displacing the movable member.

USTAF H. QLSON. can. :1. R N. EOE/l. 

